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The PolyChem Development & Marketing
TsongKai Technology

 

New Plastics Additive
Super Saving TK Series
improve the performance of
Injection, Extrusion, Blow Film/Mold

 

Customer Testimonials and Field Tests/Demonstrations 

 

 

 

The case study outlined below includes ONLY the brief summary of its individual
test background and result; please feel free to contact your local dealer if you want
to know more about how TK Series can help your unique plastic processing.

Case# 024: How TK additives would affect the MFI or MFR characteristic of plastic resins?

Customer:

Philippines, Brazil & Indonesia

Product:

special purpose plastic resins in pellets or granules

Resin Type:

virgin LDPE and virgin PP

Process:

extrusion or injection

Filler Type

none

Customer concerns:

Different customers plan to include TK additives as one of the key ingredients when making their special purpose compounding resins. They request to know how MFI (MFR) value will be affected by TK.

MFI Test Record (LDPE)

sample quantity: 100 gms
Test Performed at: Kayeness, Inc.
Test Date: 03/03/2008 
MI Model: 4002
Test Method: ASTM D1238 (Procedure A)

Temp: 190 deg. C
Load: 2.16 kgs
Melt Time: 360 seconds
Method A Time: 180 seconds
MFI (MFR) measurement unit: g/10 minutes

  without TK 0.1% TK 0.2% TK
MFR, X1 1.923 2.187 2.067
MFR, X2 1.873 2.180 2.063
MFR, Average 1.898 2.184 2.065
MFR Range, |X1 - X2| 0.050 0.007 0.004
MFR Increase, % - 15% 9%
Range Comparison 7.1 1.0 0.6
MFI Test Record
(PP)

 

sample quantity: 100 gms
Test Performed at: Kayeness, Inc.
Test Date: 03/04/2008 
MI Model: 4002
Test Method: ASTM D1238 (Procedure A)

Temp: 175 deg. C
Load: 2.16 kgs
Melt Time: 360 seconds
Method A Time: 180 seconds
MFI (MFR) measurement unit: g/10 minutes

  without TK 0.1% TK 0.2% TK
MFR, X1 6.260 7.063 6.603
MFR, X2 6.367 7.023 6.633
MFR, Average 6.314 7.043 6.618
MFR Range, |X1 - X2| 0.107 0.040 0.030
MFR Increase, % - 12% 5%
Range Comparison 2.7 1.0 0.8
Discussion
  1. MFI with standard TK dosage will increase 15% for LDPE and 12% for PP (see Discussion #3)
  2. MFI range can be reduced after TK treatment; the range ratio is about 7:1 for LDPE and 3:1 for PP (see Discussion #4)
  3. MFI is an assessment of average molecular mass and is an inverse measure of the melt viscosity. In other words, the higher an MFI, the more polymer flows under test conditions. TK helps the processing of lower melt index, tougher, stronger resins. Lower MFI resins treated with TK can be used at a lower gauge with equivalent strength, saving power and raw material expenses.
  4. Besides the MFI value increase; the other important advantage of TK upon MFI is that TK would significantly reduce the RANGE of MFI of plastic resins. The reason is probably that the resin (especially for recycled resin) may suffer from either crosslinking or polymer chain scission during reprocessing, both altering the molecular-weight distribution which in turn will result in an inconsistent MFI value from batch to batch of the resin production, and in the worst case, even within the same batch of the resin. Eventually this inconsistent MFI (i.e. larger range or higher deviation of MFI value) will potentially cause processing problems for subsequent users and an adverse effect in the physical properties of its finished products. TK additives, with its unique chemical and physical properties; is able to mitigate the weakness due to inconsistent MFI value and subsequently avoid the unfavorable processing errors.
  5. More MFI tests should be performed to verify the possible over-lubrication effect when using higher TK dosages (i.e. 0.2% TK in above tests).
  6. Additional MFI tests will be tested for recycled resins and resins with calpet.

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